gdb/vax-bsd-nat.c

   1 /* Native-dependent code for modern VAX BSD's.
   2
   3    Copyright (C) 2004-2017 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "inferior.h"
  22 #include "regcache.h"
  23 #include "target.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/ptrace.h>
  27 #include <machine/reg.h>
  28
  29 #include "vax-tdep.h"
  30 #include "inf-ptrace.h"
  31
  32 /* Supply the general-purpose registers stored in GREGS to REGCACHE.  */
  33
  34 static void
  35 vaxbsd_supply_gregset (struct regcache *regcache, const void *gregs)
  36 {
  37   const gdb_byte *regs = gregs;
  38   int regnum;
  39
  40   for (regnum = 0; regnum < VAX_NUM_REGS; regnum++)
  41     regcache_raw_supply (regcache, regnum, regs + regnum * 4);
  42 }
  43
  44 /* Collect the general-purpose registers from REGCACHE and store them
  45    in GREGS.  */
  46
  47 static void
  48 vaxbsd_collect_gregset (const struct regcache *regcache,
  49                         void *gregs, int regnum)
  50 {
  51   gdb_byte *regs = gregs;
  52   int i;
  53
  54   for (i = 0; i <= VAX_NUM_REGS; i++)
  55     {
  56       if (regnum == -1 || regnum == i)
  57         regcache_raw_collect (regcache, i, regs + i * 4);
  58     }
  59 }
  60 \f
  61
  62 /* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
  63    for all registers.  */
  64
  65 static void
  66 vaxbsd_fetch_inferior_registers (struct target_ops *ops,
  67                                  struct regcache *regcache, int regnum)
  68 {
  69   struct reg regs;
  70   pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
  71
  72   if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  73     perror_with_name (_("Couldn't get registers"));
  74
  75   vaxbsd_supply_gregset (regcache, &regs);
  76 }
  77
  78 /* Store register REGNUM back into the inferior.  If REGNUM is -1, do
  79    this for all registers.  */
  80
  81 static void
  82 vaxbsd_store_inferior_registers (struct target_ops *ops,
  83                                  struct regcache *regcache, int regnum)
  84 {
  85   struct reg regs;
  86   pid_t pid = ptid_get_pid (regcache_get_ptid (regcache));
  87
  88   if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  89     perror_with_name (_("Couldn't get registers"));
  90
  91   vaxbsd_collect_gregset (regcache, &regs, regnum);
  92
  93   if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
  94     perror_with_name (_("Couldn't write registers"));
  95 }
  96 \f
  97
  98 /* Support for debugging kernel virtual memory images.  */
  99
 100 #include <machine/pcb.h>
 101
 102 #include "bsd-kvm.h"
 103
 104 static int
 105 vaxbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
 106 {
 107   int regnum;
 108
 109   /* The following is true for OpenBSD 3.5:
 110
 111      The pcb contains the register state at the context switch inside
 112      cpu_switch().  */
 113
 114   /* The stack pointer shouldn't be zero.  */
 115   if (pcb->KSP == 0)
 116     return 0;
 117
 118   for (regnum = VAX_R0_REGNUM; regnum < VAX_AP_REGNUM; regnum++)
 119     regcache_raw_supply (regcache, regnum, &pcb->R[regnum - VAX_R0_REGNUM]);
 120   regcache_raw_supply (regcache, VAX_AP_REGNUM, &pcb->AP);
 121   regcache_raw_supply (regcache, VAX_FP_REGNUM, &pcb->FP);
 122   regcache_raw_supply (regcache, VAX_SP_REGNUM, &pcb->KSP);
 123   regcache_raw_supply (regcache, VAX_PC_REGNUM, &pcb->PC);
 124   regcache_raw_supply (regcache, VAX_PS_REGNUM, &pcb->PSL);
 125
 126   return 1;
 127 }
 128 \f
 129
 130 /* Provide a prototype to silence -Wmissing-prototypes.  */
 131 void _initialize_vaxbsd_nat (void);
 132
 133 void
 134 _initialize_vaxbsd_nat (void)
 135 {
 136   struct target_ops *t;
 137
 138   t = inf_ptrace_target ();
 139   t->to_fetch_registers = vaxbsd_fetch_inferior_registers;
 140   t->to_store_registers = vaxbsd_store_inferior_registers;
 141   add_target (t);
 142
 143   /* Support debugging kernel virtual memory images.  */
 144   bsd_kvm_add_target (vaxbsd_supply_pcb);
 145 }